Evidence That Anemia Accelerates AS Progression Via Shear-Induced TGF-β1 Activation: Heyde's Syndrome Comes Full...

Area of Science:

• Cardiovascular Medicine
• Hematology
• Gastroenterology

Background:

• Aortic stenosis (AS) is linked to acquired von Willebrand syndrome (AVWS) and gastrointestinal bleeding, a condition known as Heyde's syndrome.
• The interplay between anemia, AS, and AVWS requires further elucidation.

Purpose of the Study:

• To investigate the relationship between anemia, AS severity, and AVWS.
• To explore the role of transforming growth factor-beta 1 (TGF-β1) in this association.

Main Methods:

• Utilized the LA100 mouse model to study anemia induction and its effects.
• Analyzed plasma TGF-β1 levels and anemia severity in patients with AS, stratified by age.

Main Results:

• Anemia induction in LA100 mice led to increased TGF-β1 activation, AVWS, and AS progression.
• Older patients (>75 years) with severe AS exhibited higher plasma TGF-β1 and more severe anemia compared to younger patients (<75 years).
• A significant correlation was observed between TGF-β1 levels and anemia severity in AS patients.

Conclusions:

• Findings support the hypothesis that anemia in Heyde's syndrome contributes to AS progression.
• Anemia may exacerbate AS through shear stress-induced (WSS) platelet TGF-β1 activation.
• This mechanism may also contribute to additional gastrointestinal bleeding via WSS-induced AVWS.